WO2023077930A1

WO2023077930A1 - Linear motor driving method and circuit, and related apparatus

Info

Publication number: WO2023077930A1
Application number: PCT/CN2022/115743
Authority: WO
Inventors: 贺文钦
Original assignee: 荣耀终端有限公司
Priority date: 2021-11-05
Filing date: 2022-08-30
Publication date: 2023-05-11
Also published as: CN116094412A; EP4199343A4; EP4199343A1

Abstract

A linear motor driving method and circuit, and a related apparatus. The method is applied to a linear motor driving circuit. The linear motor driving circuit comprises a power source module, a control module, a driving module, a linear motor and an energy recovery module. In the method, the power source module can supply power to the driving module and the control module, such that the control module controls the driving module to be started to drive the linear motor to operate, and thus an electronic device generates a vibration effect; and the control module can then control the driving module to be turned off to stop driving the linear motor to operate, but the linear motor continues to perform damping vibrations because of inertia, and specifically, a coil of the linear motor generates an induced electromotive force during vibrations. Therefore, after the driving module is turned off, the control module may still control the energy recovery module to recover electric energy generated by the damping vibrations of the linear motor. The recovered electric energy is then supplied to other low-power-consumption modules for use, thereby improving the power supply efficiency of the linear motor driving circuit, reducing the electric energy loss, and prolonging the endurance time.

Description

Linear motor driving method, circuit and related device

This application claims the priority of the Chinese patent application with application number 202111307964.7 and application title "Linear Motor Drive Method, Circuit and Related Devices" filed with the China Patent Office on November 05, 2021, the entire contents of which are incorporated herein by reference Applying.

technical field

The present application relates to the field of hardware technology, in particular to a linear motor driving method, circuit and related devices.

Background technique

More and more electronic products, such as mobile phones, stylus pens, smart watches, bracelets, etc., are equipped with motors to provide users with a vibration experience. Among them, the linear motor is widely used in various electronic products because of its good vibration effect. However, in the drive circuit of the linear motor used in current electronic products, when the drive circuit stops driving or is turned off, the linear motor will continue to vibrate for a period of time due to inertia, and then gradually stop moving under pure mechanical damping. Specifically, the coil of the linear motor generates an induced electromotive force during the vibration damping process. At this time, because the circuit is in a high-resistance state or does not form a loop, the induced electromotive force generated is not utilized, resulting in energy waste.

Based on the above problems, how to reduce the power loss of the linear motor drive device, improve the power supply efficiency of the circuit, and increase the battery life of the electronic product is an urgent problem to be solved.

Contents of the invention

The application provides a linear motor driving method, circuit and related devices. In this method, the linear motor drive circuit can realize the recovery of electric energy generated by the linear motor damping vibration, and supply the recovered electric energy to a low-power consumption module such as a control module, thereby improving the power supply efficiency of the circuit and reducing power loss.

In a first aspect, the present application provides a linear motor drive circuit, the linear motor drive circuit includes: a control module, a drive module, a linear motor, and an energy recovery module; wherein: when the control module controls the drive module to stop driving the linear When the motor vibrates, the linear motor is used to damp the vibration; the control module is also used to control the energy recovery module to collect the electric energy generated by the linear motor during the damped vibration.

After adopting the linear motor drive circuit provided in the first aspect, the energy recovery module can be controlled to recycle the electric energy generated by the linear motor during the vibration damping process, so as to avoid energy waste. In addition, since the induced electromotive force generated by the inertia of the linear motor forms a loop with the energy recovery circuit, the linear motor generates a counter electromotive force that hinders vibration and prevents it from continuing to vibrate, thereby shortening the vibration tailing time of the linear motor and making the vibration experience of the user more effective. Follow simply.

In combination with the linear motor drive circuit provided in the first aspect, the energy recovery module is also used to provide the collected electric energy to the first module after the energy recovery module collects the electric energy generated by the linear motor during the vibration damping; The first module includes: any one or more items of the control module and other low-power consumption chips.

In this way, the recovered electric energy can be supplied to other low-power consumption modules such as the control module, thereby improving the power supply efficiency of the linear motor drive circuit, reducing electric energy loss, and increasing battery life.

In combination with the linear motor drive circuit provided in the first aspect, the control module is further used to control the drive module to drive the linear motor to vibrate before the control module controls the drive module to stop driving the linear motor to vibrate.

In combination with the linear motor drive circuit provided in the first aspect, the energy recovery module includes: a rectification circuit and an energy storage circuit; wherein: the rectification circuit is used to convert the collected first voltage generated by the linear motor during vibration damping into a second Two voltages; the first voltage is a voltage with alternating positive and negative polarities and varying amplitude; the second voltage is a unidirectional pulsating DC voltage with constant polarity and varying amplitude. The energy storage circuit is used to store the collected electric energy generated by the linear motor during vibration damping.

In this way, the positive and negative alternating electromotive force generated by the recovered linear motor can be adjusted to a positive voltage, that is, the AC voltage is converted into a DC voltage, which is convenient for providing working voltage to other circuits.

In combination with the linear motor drive circuit provided in the first aspect, the energy recovery module further includes a filter circuit, and the filter circuit is used to convert the second voltage output by the rectification circuit into a third voltage; the third voltage and the second voltage The polarities are the same, and the amplitude variation coefficient of the third voltage is lower than the amplitude variation coefficient of the second voltage; or, the energy recovery module further includes a boost circuit, and the boost circuit is used to convert the second voltage to A fourth voltage; the polarity of the fourth voltage is the same as that of the second voltage, and the magnitude of the fourth voltage is greater than the magnitude of the second voltage; or, the energy recovery module further includes a filter circuit and a boost circuit. Wherein, the filter circuit is used to convert the second voltage output by the rectifier circuit into a third voltage, and then the boost circuit is used to convert the third voltage into a fifth voltage; the fifth voltage and the third voltage have the same polarity, the magnitude of the fifth voltage is greater than the magnitude of the third voltage; or, the step-up circuit is used to convert the second voltage into a fourth voltage, and then the filter circuit is used to convert the second voltage to a fourth voltage. The four voltages are transformed into a sixth voltage; the sixth voltage has the same polarity as the fourth voltage, and the amplitude variation coefficient of the sixth voltage is lower than the amplitude variation coefficient of the fourth voltage.

In this way, the DC voltage output by the rectifier circuit in the energy recovery circuit can be filtered, thereby smoothing out the AC component therein, so that the recovered electric energy is more stable. In addition, the voltage can be boosted so that the recovered electric energy is sufficient to support other circuits.

In combination with the linear motor drive circuit provided in the first aspect, the rectification circuit is specifically any of the following: full-wave rectification, half-wave rectification; the energy storage circuit is specifically a capacitor, an inductor, a battery, or a circuit composed of capacitors and inductors connected in series and in parallel The filter circuit is specifically any of the following: a capacitor filter circuit, an inductance filter circuit, a π-type RC filter circuit, a π-type LC filter circuit, an active filter circuit or an electronic filter circuit; the boost circuit is specifically any of the following Item: Boost DC/DC Converter, Boost Circuit, Boost Charge Pump.

In this way, the method provided by the present application can be applied in various specific circuit implementation forms of the linear motor driving circuit, thereby further improving the practicability of the method.

In combination with the linear motor driving circuit provided in the first aspect, the driving module and the rectifying module are integrated in the same electronic circuit or independently in different electronic circuits.

In this way, the method provided by the present application can be applied in various specific circuit integration manners of the linear motor driving circuit, thereby further improving the practicability of the method.

In the second aspect, the present application provides a linear motor drive method, which is applied to a linear motor drive circuit, and the linear motor drive circuit includes: a control module, a drive module, a linear motor, and an energy recovery module; the method includes: the control The module controls the driving module to stop driving the linear motor to vibrate, and the linear motor starts to damp vibration after it stops being driven; the control module controls the energy recovery module to collect the electric energy generated by the linear motor during damping vibration.

After implementing the linear motor drive method provided in the second aspect, the energy recovery module can be controlled to recycle the electric energy generated by the linear motor during the vibration damping process to avoid energy waste. In addition, since the induced electromotive force generated by the inertia of the linear motor forms a loop with the energy recovery circuit, the linear motor generates a counter electromotive force that hinders vibration and prevents it from continuing to vibrate, thereby shortening the vibration tailing time of the linear motor and making the vibration experience of the user more effective. Follow simply.

In combination with the linear motor driving method provided in the second aspect, after the energy recovery module collects the electric energy generated by the linear motor in damping vibration, the method further includes: the energy recovery module provides the collected electric energy to the first module; The first module includes: any one or more items of the control module and other low-power consumption chips.

With reference to the linear motor driving method provided in the second aspect, before the control module controls the drive module to stop driving the linear motor to vibrate, the method further includes: the control module controls the drive module to start, and the drive module drives the linear motor to vibrate.

In combination with the linear motor drive method provided in the second aspect, the energy recovery module includes: a rectification circuit and an energy storage circuit; the energy recovery module collects the electric energy generated in the damped vibration of the linear motor, specifically includes: The first voltage generated by the linear motor in damped vibration is converted into a second voltage; the first voltage is a voltage with alternating positive and negative polarities and amplitude changes; the second voltage is a single voltage with constant polarity and amplitude changes To the pulsating DC voltage. The energy storage circuit is used to store the collected electric energy generated by the linear motor during vibration damping.

In combination with the linear motor driving method provided in the second aspect, the energy recovery module further includes a filter circuit, and the filter circuit is used to convert the second voltage output by the rectification circuit into a third voltage; the third voltage and the pole of the second voltage same, the amplitude variation coefficient of the third voltage is lower than the amplitude variation coefficient of the second voltage; or, the energy recovery module further includes a boost circuit, and the boost circuit is used to convert the second voltage into a first voltage Four voltages; the polarity of the fourth voltage is the same as that of the second voltage, and the amplitude of the fourth voltage is greater than the amplitude of the second voltage; or, the energy recovery module further includes a filter circuit and a boost circuit. Wherein, the filter circuit first converts the second voltage output by the rectifier circuit into a third voltage, and then, the boost circuit converts the third voltage into a fifth voltage; the polarity of the fifth voltage and the third voltage Similarly, the amplitude of the fifth voltage is greater than the amplitude of the third voltage; or, the boost circuit first converts the second voltage into a fourth voltage, and then the filter circuit converts the fourth voltage into a sixth voltage Voltage; the polarity of the sixth voltage is the same as that of the fourth voltage, and the amplitude variation coefficient of the sixth voltage is lower than the amplitude variation coefficient of the fourth voltage.

In combination with the linear motor drive method provided in the second aspect, the rectification circuit is specifically any of the following: full-wave rectification, half-wave rectification; the energy storage circuit is specifically a capacitor, an inductor, a battery, or a circuit composed of capacitors and inductors connected in series and in parallel The filter circuit is specifically any of the following: a capacitor filter circuit, an inductance filter circuit, a π-type RC filter circuit, a π-type LC filter circuit, an active filter circuit or an electronic filter circuit; the boost circuit is specifically any of the following Item: Boost DC/DC Converter, Boost Circuit, Boost Charge Pump.

In combination with the linear motor driving method provided in the second aspect, the driving module and the rectifying module are integrated in the same electronic circuit or independently in different electronic circuits.

In a third aspect, the present application provides a chip, the chip is applied to a linear motor drive circuit, the chip includes one or more processors, and the processor is used to call computer instructions so that the linear motor drive circuit performs the second aspect any of the methods described.

In a fourth aspect, the present application provides a computer-readable storage medium, including instructions, which, when the instructions are run in the linear motor drive circuit, cause the linear motor drive circuit to execute the method described in any one of the second aspect.

In a fifth aspect, the present application provides an electronic device, which includes one or more processors, one or more memories, and a linear motor drive circuit; wherein, the one or more memories and the one or more processing The one or more memories are used to store computer program codes, the computer program codes include computer instructions, and when the one or more processors execute the computer instructions, the electronic device executes any one of the second aspect method described.

Description of drawings

FIG. 1 is a topological diagram of a linear motor drive circuit provided by an embodiment of the present application;

Fig. 2 is a schematic diagram of a linear motor driving device provided by the embodiment of the present application;

Fig. 3 is a schematic diagram of another linear motor driving device provided by the embodiment of the present application;

Fig. 4 is a simulation diagram of the voltage waveform in the energy recovery module when a linear motor damps vibration provided by the embodiment of the present application;

FIG. 5A is a topological diagram of a linear motor driving circuit provided by an embodiment of the present application;

FIG. 5B is an equivalent circuit topology diagram of a linear motor drive circuit provided by an embodiment of the present application;

FIG. 5C is an equivalent circuit topology diagram of a linear motor drive circuit provided by an embodiment of the present application;

FIG. 6A is another topology diagram of a linear motor drive circuit provided by the embodiment of the present application;

FIG. 6B is an equivalent circuit topology diagram of another linear motor drive circuit provided by the embodiment of the present application;

FIG. 6C is an equivalent circuit topology diagram of another linear motor drive circuit provided by the embodiment of the present application;

FIG. 6D is an equivalent circuit topology diagram of another linear motor drive circuit provided by the embodiment of the present application;

FIG. 6E is an equivalent circuit topology diagram of another linear motor drive circuit provided by the embodiment of the present application;

FIG. 7 is a hardware architecture diagram of an electronic device using a linear motor provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and in detail below in conjunction with the accompanying drawings. Among them, in the description of the embodiments of this application, unless otherwise specified, "/" means or means, for example, A/B can mean A or B; "and/or" in the text is only a description of associated objects The association relationship of indicates that there may be three kinds of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently.

Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as implying or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present application, unless otherwise specified, the "multiple" The meaning is two or more.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

More and more products are now equipped with linear motor devices. Compared with the rotor motor, which was widely used in electronic products in the early years, the linear motor can bring users a better vibration experience. Specifically, the linear motor is mainly composed of a stator and a mover. The mover is mainly composed of a special mass block, a spring, and a magnet. The stator is composed of a flexible printed circuit board (FPC) and a surrounding coil. When the linear motor receives the drive signal, the stator coil in the linear motor is energized. Due to the existence of the magnetic field, according to the magnetic effect of the current discovered by the physicist Oersted, the stator will be affected by the magnetic field force and will move in a specific direction. For example, the mover is driven to move horizontally, that is, left and right, so as to generate a sense of shock. It can be seen that the working principle of the linear motor is similar to that of a pile driver. The linear motor mainly converts electrical energy into mechanical energy, directly converts electrical energy into linear motion mechanical energy, and drives the spring mass to perform linear motion, thereby generating vibration. This vibration brings The user's vibration is similar to the effect of "da da da".

Referring to FIG. 1 , FIG. 1 exemplarily shows a schematic diagram of a linear motor drive circuit in an electronic product.

As shown in Figure 1, the drive circuit is composed of a power supply, an H-bridge circuit, and a linear motor. The power supply supplies power to the H bridge, so that the H bridge drives the linear motor to work. Next, the working principle of the H-bridge driven linear motor will be introduced in detail.

When Q1 and Q3 are turned on and Q2 and Q4 are turned off, the linear motor moves to the right, and the direction of this movement is recorded as the positive direction.

When Q1 and Q3 are cut off, Q2 and Q4 are turned on, the linear motor moves to the left, and the direction of this movement is recorded as the negative direction.

When Q1 and Q2 are turned on, and Q3 and Q4 are turned off, it is equivalent to a short circuit of the power supply, which will burn the power supply, which will not occur under normal circumstances.

When Q1, Q2, Q3 and Q4 are all cut off, the linear motor is considered to be in a "coasting" state. Specifically, the electric potential generated by the inertia of the linear motor will not be able to form a loop, so that there will be no ampere force hindering the movement, and the linear motor will move for a long time due to inertia.

It can be seen from the circuit diagram of a linear motor device shown in Figure 1 that the linear motor device only includes: a drive circuit, when the drive circuit is powered off, that is, when Q1, Q2, Q3 and Q4 are all off, the linear motor will Keep vibrating side to side. The induced electromotive force generated by the vibration cannot form a loop (that is, the circuit is in a high-resistance state), and the induced electromotive force is not used. The linear motor will gradually stop vibrating under pure mechanical damping.

In order to solve the technical problems existing in the linear motor driving circuit shown in FIG. 1 , the present application provides a linear motor driving method, circuit and related devices. The method is applied in electronic equipment, and the drive circuit includes a power supply module, a control module, a drive module, a linear motor, and an energy recovery module. In this method, the power supply module can supply power to the drive module and the control module, so that the control module can control the drive module to turn on and drive the linear motor to work, so that the electronic device can produce a vibration effect; after that, the control module can control the drive module to turn off and stop driving the linear motor work, but the linear motor will continue to damp vibration due to inertia. Specifically, the coil in the linear motor will generate an induced electromotive force during vibration. Therefore, after the drive module is turned off, the control module also controls the energy recovery module to work, that is, recovers the electric energy generated by the damped vibration of the linear motor. Afterwards, the recovered electric energy is supplied to low power consumption modules such as control modules for use. Thereby improving the power supply efficiency of electronic equipment, reducing power loss, and increasing battery life.

Next, a schematic diagram of a linear motor driving device provided by an embodiment of the present application will be introduced with reference to FIG. 2 .

As shown in Fig. 2, the linear motor drive device includes: a power supply, a control module, a drive module, a linear motor and an energy recovery module. Among them, the output end of the power supply is connected to the input end of the control module, the output end of the control module is connected to the input end of the drive module, the output end of the drive module is connected to the linear motor, and the output end of the drive module is also connected to the energy recovery module; the output end of the energy recovery module is connected to, for example, the control The input terminal of the module or other low-power circuit modules in electronic equipment, etc.

The power supply is used to provide the operating voltage for the linear motor drive. Specifically, the output end of the power supply is connected to the input end of the control module, and the control module can control the operation of the drive module, thereby driving the linear motor to vibrate.

The control module is used to output a signal source to control the work of the drive module. The signal waveform output by the control module may be PWM or other low-frequency driving signals, etc., which is not limited in this embodiment of the present application.

The specific implementation form of the drive module can be any of the following drivers and amplifiers: half-bridge (BTL) driver, full-bridge driver, class D amplifier (Class D), class H amplifier (Class H), and class AB amplifier (Class AB )etc. The embodiment of the present application does not limit this.

The linear motor is a motor with a specific vibration direction introduced above, so I won’t go into details here.

The energy recovery module can be used to collect the induced electromotive force generated by the motor coil cutting the magnetic induction line in the magnetic field when the linear motor continues to damp vibration due to inertia after the drive module is turned off. The specific circuit structure of the energy recovery module will be introduced in detail below, and will not be repeated here. It should be noted that, in other embodiments of the present application, the energy recovery module is also used to recover energy in other scenarios. Specifically, taking electronic products such as mobile phones and wristbands as examples, when the motors used to generate vibration effects in these electronic products, when external factors such as the shaking of the electronic product held by the user, instead of the drive circuit driving the vibration , the mass block in the motor will also start to vibrate due to external force shaking. At this time, the energy recovery module can also recover the energy generated by it.

It can be understood that Fig. 2 only exemplarily shows the intention of the basic modules contained in the linear motor drive device, and in some embodiments of the present application, each module contained in the linear motor drive device shown in Fig. 2 also has more functions The circuit, see Figure 3 for details.

It can be understood that the various modules included in the linear motor driving device shown in FIG. For example, for example, a driver module may be called a driver module, which is not limited in this embodiment of the present application. The functions of each module have been described above, and the specific implementation circuits of each module will be introduced in detail below.

In other embodiments of the present application, each module shown in FIG. 2 may be split into one or more other modules, and reference may be made to FIG. 3 for details.

As shown in FIG. 3, the above-mentioned control module may specifically include: a processor/system-on-chip (System on Chip, SoC), a control and power supply circuit. The control and power supply circuits may be integrated circuits integrated on the same chip, or integrated circuits integrated on different chips, which is not limited in this embodiment of the present application.

The energy recovery module mentioned above may specifically include: a rectification circuit, a filter circuit, a boost circuit, an energy storage circuit, and the like. Among them, the rectifier circuit and the energy storage circuit are electronic circuits that must be included in the energy recovery module, while the filter circuit and the boost circuit are optional electronic circuits in the energy recovery module. And, the energy storage circuit is connected as the last-level electronic circuit in the energy recovery module. The rectifier circuit is connected as the first-stage electronic circuit in the energy recovery module. The output end of the rectifier circuit can be connected to the filter circuit first and then to the booster circuit, or connected to the booster circuit first and then to the filter circuit. The embodiment of the present application does not limit this. Next, the function of each circuit in the energy recovery module will be introduced by taking the rectifier circuit, filter circuit, booster circuit, and energy storage circuit in series to form the energy recovery module. The principles of other series connection sequences are similar and will not be repeated here.

The rectification circuit may specifically use various forms such as half-wave rectification and full-wave rectification, which are not limited in this embodiment of the present application. The function of the rectifier circuit is to convert the AC voltage into a unidirectional pulsating DC voltage. The so-called AC voltage means that the amplitude and polarity of the voltage change with time. The so-called unidirectional pulsating DC voltage means that the voltage changes with time, but the voltage Direct current that does not change polarity. In the embodiment of the present application, the input voltage of the rectifier circuit is the induced electromotive force generated by the linear motor during the vibration damping process, which means that the induced current in the loop is an alternating current. The voltage cannot be directly supplied to other electronic circuits in electronic equipment, so a rectification circuit is required to convert it into DC voltage before it can be supplied to other electronic circuits, so the output voltage of the rectification circuit is the voltage obtained after rectification with the same polarity . The voltage waveform simulation diagram of the input and output terminals of the rectifier circuit will be introduced in detail in the voltage simulation diagram shown in Figure 4 later, and will not be repeated here.

Wherein, the filter circuit is used to smooth the AC component in the collected electric energy. Specifically, since the output of the rectification circuit is a unidirectional pulsating DC voltage. The filter circuit smoothes out the AC component in the unidirectional pulsating DC voltage as much as possible, and obtains a DC voltage with a relatively stable voltage amplitude.

Among them, the role of the boost circuit is to convert the filtered low voltage into a high voltage that can be used by other electronic circuits. The implementation form of the boost circuit can be any of the following: boost DC/DC converter, Boost circuit, boost charge pump (Charge Pump) and so on. It can be understood that the boost module is an optional module, and the presence of the boost circuit can be determined according to the rectified voltage. For example, when the rectified voltage is greater than the preset voltage, no boost is required. The preset voltage is determined by the working voltage of the electronic circuit module to be supplied by the energy storage circuit, usually the working voltage of the electronic circuit module such as the control circuit is 0.8V-1V. The simulation diagram of the voltage waveform at the output end of the booster circuit will be introduced in detail in the voltage simulation diagram shown in Figure 4 later, and will not be repeated here.

Wherein, the realization form of the energy storage circuit may be a capacitor, an inductor, or an energy storage element or a battery composed of capacitors and inductors connected in series and in parallel, etc., which is not limited in this embodiment of the present application. Since the vibration of the linear motor is periodic vibration, such as vibrating for one second, stopping for one second and then continuing for one second, etc., the current recovered by the rectifier module is not constant, and it is usually not suitable for direct supply to other electronic circuits Therefore, an energy storage circuit is required to store the recovered electric energy.

It can be understood that the various modules contained in the linear motor driving device shown in FIG. An example, which is not limited in this embodiment of the present application. The functions of each module have been described above, and the specific implementation circuits of each module will be introduced in detail below.

Next, the functions of the rectifier circuit and booster circuit in the energy recovery circuit shown in Figure 3 above will be further explained in conjunction with the voltage waveform simulation diagrams at different circuit positions in the energy recovery circuit shown in Figure 4 .

FIG. 4 exemplarily outputs three voltage waveform simulation diagrams, which are the waveform of the induced electromotive force, the waveform of the rectified voltage, and the waveform of the boosted voltage.

Among them, the induced electromotive force waveform is: the linear motor will generate an induced electromotive force during the vibration damping process. After the linear motor is connected to the energy recovery module shown in Figure 3 above, the input terminal in the energy recovery module is also a rectifier circuit At the input end, the detected voltage waveform is the induced electromotive force waveform. It can be seen from Figure 4 that the voltage amplitude of the induced electromotive force changes with time on the positive and negative semi-axes as a sinusoidal waveform, and the amplitude of the sinusoidal waveform gradually decreases as the linear motor damps the vibration longer. , until the linear motor stops damping the vibration, the amplitude, that is, the induced electromotive force drops to 0. Therefore, the induced electromotive force waveform is also an AC voltage waveform, which is determined by the nature of the linear motor. Specifically, the vibration state of the linear motor is left and right vibration, that is, the direction of motion of the coil in the linear motor in the magnetic field is also alternately positive and negative. Yes, so the polarity of the induced electromotive force generated by the linear motor also changes alternately in the positive and negative directions, so the amplitude of the induced electromotive force waveform is positive and negative. In addition, because the linear motor is affected by mechanical damping during the vibration process, the amplitude of all its left and right vibrations will gradually decrease until it stops vibrating, so the generated electromotive force will also gradually decrease until it is 0, so the amplitude of the induced electromotive force waveform It gradually decreases to 0 with the increase of damping vibration time.

Among them, the rectified voltage waveform is: the linear motor will generate an induced electromotive force during the vibration damping process. After the linear motor is connected to the energy recovery module shown in Figure 3 above, at the output end of the rectifier circuit in the energy recovery module, The detected voltage waveform is the rectified voltage waveform. The rectified voltage is the output voltage after the induced electromotive force passes through the rectification circuit. It can be seen from Figure 4 that the amplitude of the rectified voltage fluctuates periodically on the positive half axis, and as the linear motor damps the vibration longer, the amplitude of the voltage waveform gradually decreases until the linear motor stops damping the vibration , the amplitude, that is, the voltage drop is zero. Therefore, the rectified voltage waveform can also be called unidirectional pulsating DC voltage. The so-called unidirectional means that the voltage polarity is consistent at all times. Above, the voltage waveform presents a periodic change. Comparing the waveform of the induced electromotive force and the waveform of the rectified voltage, it can be seen that the rectifier circuit converts the negative part of the input induced electromotive force into a positive voltage, thereby realizing the conversion of the AC voltage into a DC voltage, but the DC contains an AC component, and the AC The component refers to the unstable part of the voltage amplitude, and the AC component can be smoothed by the filter circuit to obtain a stable DC voltage. For the specific implementation manner of the rectifier circuit, reference may be made to the detailed description below.

Among them, the boost voltage waveform is: the linear motor will generate an induced electromotive force during the vibration damping process. After the linear motor is connected to the energy recovery module shown in Figure 3 above, the boost circuit in the energy recovery module outputs terminal, the detected voltage waveform is the rectified voltage waveform. The boosted voltage is the output voltage after the rectified voltage passes through the booster circuit. It can be seen from Figure 4 that the amplitude of the boost voltage changes with time into a relatively stable straight line. When the linear motor stops damping the vibration, the magnitude of the voltage goes to zero. Comparing the waveform of the rectified voltage and the waveform of the boosted voltage, it can be seen that the boost circuit increases the magnitude of the input rectified voltage, thereby converting the low voltage into a high voltage. For the specific implementation manner of the rectifier circuit, reference may be made to the detailed description below.

The function of the energy recovery module is introduced based on the linear motor drive device provided by the present application introduced in Figure 2 and Figure 3 above, and through the three voltage waveforms in the energy recovery circuit shown in Figure 4 . Next, a specific circuit structure for realizing the above functions will be introduced in conjunction with FIG. 5A and FIG. 6A .

It can be understood that the various modules or electronic circuits contained in the linear motor driving device can be integrated in the same electronic circuit, or can be independently in different electronic circuits. The embodiment of the present application does not limit this. Next, we will only introduce the drive module and rectifier circuit shown in Figure 5A in different electronic circuits, and take the drive module and rectifier circuit shown in Figure 6A integrated in the same electronic circuit as an example to introduce the A specific circuit implementation method of a linear motor drive device.

Circuit implementation one:

Referring to FIG. 5A , FIG. 5A schematically shows a structure of a linear motor driving circuit.

As shown in FIG. 5A , the structure of the linear motor drive circuit includes: a drive circuit 51 , a linear motor 52 , a rectifier circuit 53 , a boost circuit 54 and an energy storage circuit 55 . The driving circuit 51 corresponds to the above-mentioned driving module; the rectifying circuit 53 , the boost circuit 54 and the energy storage circuit 55 correspond to the above-mentioned energy recovery module. Wherein, the output end of the driving circuit 51 is connected with the linear motor, and the input end of the rectification circuit 53 is connected through the switch Q5; the output end of the rectification circuit 53 is connected with the input end of the boost circuit 54; the output end of the boost circuit 54 is connected with the energy storage circuit input.

The drive circuit 51 is similar to the letter "H" and is called "H-bridge drive". The H-bridge drive contains four independently controlled switching components. The components that can be used as electronic switches in the circuit include: triode, metal-oxide layer semiconductor Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), etc. In addition, other switching elements in the driving circuit 51, such as Q4, Q5, Q6, and Q7, etc., can also be triodes and MOSFETs. FIG. 5A only exemplarily shows that a MOSFET is used as a switching element, but this is not limited in this embodiment of the present application.

The working principle of the linear motor is similar to that introduced in Figure 1 above. The processor can control the vibration process of the linear motor by controlling the states of the four switching components of the H-bridge. details as follows:

The processor can control the working state of each switch by inputting control signals to the switch components. When the control signal can be, for example, a pulse width modulation (PWM) signal:

First, the bias of the base of the triode or the gate of the MOSFET can be modulated by the PWM signal to realize the turn-on and cut-off of the four switching elements of the triode or MOSFET, namely Q1-Q4. When the PWM signal is at a high level, the triode or MOSFET is controlled to be turned on; when the PWM signal is at a low level, the triode or MOSFET is controlled to be turned off, thereby realizing the on or off state of the switching elements in each electronic circuit. In addition, the turn-on and turn-off times of the four switching elements Q1-Q4, which are triodes or MOSFETs, can also be changed by adjusting the duty cycle of the PWM. The PWM duty cycle is the proportion of the high level in the entire period of a pulse cycle, for example, the duty cycle of the PWM wave with a high level for 1 second and a low level for 1 second is 50%. The larger the duty cycle, the larger the equivalent voltage on the linear motor, and the corresponding vibration speed and amplitude of the linear motor will increase. Normally, the PWM frequency is generally between 10KHz and 50KHz. If the frequency is too low, the fineness of the waveform will be poor, and the voltage waveform will be relatively rough, which will easily generate noise and abnormal sound. If the frequency is too high, the efficiency of the system will be reduced due to the switching loss of the MOS tube.

It can be understood that the signal used to control the on and off of the switching element is not limited to the above-mentioned PWM signal, and there are other forms of low-frequency modulation signals, for example, the embodiment of the present application does not limit this.

Next, with reference to FIG. 5B-FIG. 5C , FIG. 5B-FIG. 5C exemplarily show an equivalent circuit diagram for driving a linear motor to vibrate by controlling the on and off of Q1-Q4 via a PWM signal.

As shown in FIG. 5B, when the PWM signal is input to Q1 and Q3, and Q2 and Q4 have no PWM signal input or the duty ratio of the PWM signal input by Q2 and Q4 is 0, the equivalent circuit of the driving circuit 51 is Q1 It is turned on with Q3, the branch where Q2 and Q4 are located is disconnected, the power supply voltage first passes through Q1 and then flows from the left end of the linear motor to the right end and is grounded through Q3, thereby providing the linear motor with a driving current to the right, thereby driving the linear motor to vibrate to the right .

As shown in FIG. 5C, when the PWM signal is input to Q2 and Q4, and there is no PWM signal input to Q1 and Q3 or the duty cycle of the PWM signal input by Q1 and Q3 is 0, the equivalent circuit of the driving circuit 51 is Q2 The branch circuit where Q1 and Q3 are located is disconnected, the power supply voltage first flows through Q4 from the right end of the linear motor to the left end and is grounded through Q2, thereby providing the linear motor with a driving current to the left, thereby driving the linear motor to the Vibrate left.

And by controlling the duty cycle of the PWM signal, the vibration speed of the linear motor is controlled. When the duty cycle of the PWM signal is larger, the equivalent voltage (power supply voltage multiplied by the duty cycle) applied to the motion of the linear motor is larger, and the vibration speed of the corresponding motor will be faster. When the duty cycle of the PWM signal is controlled When it is 0, the switching element is cut off, and the voltage on the linear motor is 0. At this time, the drive of the linear motor is stopped to stop vibration, but the linear motor is used for damping vibration. During damped vibration, the linear motor generates an induced electromotive force.

First of all, the induced electromotive force generated by the inertia of the linear motor and the energy recovery circuit form a loop, so that the linear motor generates a counter electromotive force that hinders vibration and prevents it from continuing to vibrate, thereby shortening the vibration tailing time of the linear motor and making the user's vibration experience better. simply.

In addition, the induced current generated by the linear motor during mechanical vibration will flow to the rectifier circuit of the energy recovery module through the switch Q5. Next, the working principle of the rectifier circuit is introduced in detail, as follows:

The rectification circuit 53 mainly includes: two-stage operational amplifier circuits OPA1 and OPA2, and two feedback resistors R1 and R2 with equal resistance. In particular, the operational amplifier circuit specifically uses a Rail to Rail operational amplifier. Rail to Rail op amp is also called full scale op amp. The output voltage amplitude of this kind of op amp is very close to the input voltage when it is no-load, while the maximum output amplitude of general op amp is about 2~3V lower than the input voltage.

Among them, the function of OPA1 and OPA2 is to convert the positive and negative alternating induced electromotive force generated by the linear motor 52 during the vibration damping process into a always positive voltage, specifically as follows:

1. When the input voltage is positive, OPA1 is equivalent to a follower, the amplification factor of OPA1 is approximately equal to 1, and the output voltage of OPA1 is approximately equal to the input voltage. At this time, the two input terminals of OPA2 are equipotential, and the final output voltage of OPA2 is equal to the input voltage. .

2. When the input voltage is negative, the output voltage of OPA1 is 0. Since the resistance values of R1 and R2 are equal, OPA2 is equivalent to an inverse amplifier with a magnification of -1, so the final output voltage of OPA2 is equal to -1 times the input voltage.

It can be understood that the rectification circuit 53 shown in FIG. 5A is only an example, and the specific implementation form of the rectification circuit can also be other circuits capable of adjusting a voltage with a polarity change or a flow direction into a voltage with a constant polarity or a flow direction. An electronic circuit with constant current is not limited in this embodiment of the present application.

In addition, since the output voltage of the rectifier circuit is the unidirectional pulsating DC voltage shown in Figure 4, the unidirectional pulsating DC voltage can be decomposed into a DC voltage and a group of AC voltages with different frequencies, and the magnitude of the voltage is unstable. directly to electronic circuits. Therefore, it is necessary to filter the output voltage, eliminate the AC component in the voltage, and then use it for electronic circuits after it becomes DC.

In the capacitive filter circuit 531 shown in FIG. 5A , the characteristic of “blocking DC and AC” of the capacitor C1 is used to smooth the AC component. Specifically, a capacitor C1 is connected in parallel between the rectifier circuit and the load. Since the capacitor C1 is equivalent to an open circuit to DC, the DC voltage output by the rectifier circuit cannot flow into the ground terminal through C1, and can only be added to the load. The load here can be regarded as The voltage boosting circuit 54 and the energy storage circuit 55 connected in parallel by C1. For the AC component output by the rectifier circuit, because C1 has a large capacity and small capacitive reactance, the AC component flows to the ground through C1 and cannot be added to the load. In this way, the required DC voltage is extracted from the unidirectional pulsating DC through the filter of the capacitor C1. The larger the capacity of the filter capacitor C1, the smaller the capacitive reactance to the AC component, so that the smaller the AC component remaining on the load, the better the filtering effect.

This application does not limit the structure of the filter circuit and the components used. In the filter circuit, devices with special impedance characteristics to alternating current are mainly used, such as capacitors and inductors. The filter circuit structure mainly includes the following types: capacitor filter circuit, inductance filter circuit, π-type RC filter circuit, π-type LC filter circuit, active filter circuit and electronic filter circuit. In this application, only the capacitive filter circuit shown in FIG. 5A is used for analysis, and the AC component is extracted through capacitive coupling.

Generally, the induced electromotive force generated by the linear motor during the vibration damping process is small, and the rectified voltage after the AC component is removed by the ballast circuit is reduced again. In some embodiments, the low voltage output after rectification is not enough to support the provision of Other electronic circuits work. Therefore, after the rectification circuit 53, the booster circuit 54 also needs to be connected.

The boost circuit 54 shown in FIG. 5A includes: an inductor L1 , MOSFET-like switching elements such as Q6 and Q7 , a control unit, OPA3 , feedback resistors R3 and R4 , a reference voltage, and the like.

Among them, the main function of the inductor L1 is to store energy. In the first stage, the inductor L1 can store the energy output by the rectifier circuit first, and then release the stored energy and the energy output by the rectifier circuit in the second stage. Amplify the post-stage circuit.

Wherein, the control logic unit is used to realize stable boosting by controlling the switching states of Q6 and Q7. Specifically, in the first stage, when the control Q6 is turned on and Q7 is turned off, the inductor L1 is charged to the ground; in the second stage, the control Q6 is turned off, and Q7 is turned on. The load, that is, the energy storage circuit C2, discharges to realize boosting.

The boost circuit 54 in FIG. 5A is only an example, and the application does not limit the structure of the boost circuit and the components used.

Because the vibration of the linear motor is a periodic vibration, for example, when the alarm clock or the incoming call notification sound of the electronic device, the linear motor will vibrate with the ringtone for one second, stop vibrating for one second, continue to vibrate for one second, and other periodic vibrations until The alarm clock is turned off or the phone is hung up or connected; for another example, whenever an electronic device's new message notification sounds, the linear motor will vibrate for one second along with the notification sound. It can be seen that the electric energy generated by the damped vibration of the linear motor after the drive circuit stops working is not stable, so the current recovered by the rectifier module is not constant, and it is usually not suitable for direct supply to other electronic circuits. Therefore, an energy storage circuit is needed to store the recovered electric energy.

The energy storage circuit 55 shown in FIG. 5A only takes a capacitor C2 as an example. The capacitor C2 can store the electric energy supplied by the booster circuit 54 as electric field energy, and release the energy back to the circuit during the discharge process, such as to other electronic circuits. (power supply and control circuit module) provides electric energy.

In other embodiments of the present application, in addition to the capacitor C2 shown in FIG. 5A , the energy storage circuit 55 may also be composed of more capacitors, or energy storage elements such as inductors. Among them, the inductance can also convert the energy provided by the amplifier circuit 54 into magnetic field energy for a period of time and store it, and release the energy back to the circuit in the other end of time, so as to provide energy to other electronic circuits (power supply and control circuit modules). purpose of electrical energy. The embodiment of the present application does not limit the circuit components and circuit structure of the energy storage circuit 55 .

In order to simplify the linear motor driving circuit structure shown in FIG. 5A , multiple circuits included in the circuit structure shown in FIG. 5A can be integrated into one circuit module. For example, the two functions of the driving circuit 51 and the rectifying circuit 53 in FIG. 5A are integrated into one circuit structure, thereby simplifying components in the circuit and saving cost and power consumption. It can be understood that, in the wake-up motor drive circuit provided in the embodiment of the present application, other multiple circuits may also be integrated into one circuit.

Next, based on integrating the two functions of the driving circuit 51 and the rectifying circuit 53 in FIG. 5A into one circuit structure, a second circuit implementation manner will be specifically introduced.

Circuit realization two:

Referring to FIG. 6A, FIG. 6A schematically shows another topology diagram of a linear motor drive circuit;

As shown in FIG. 6A , the structure of the linear motor driving circuit includes: a driving and rectifying circuit 61 , a linear motor 62 , a boost circuit 63 and an energy storage circuit 64 . Wherein, the output end of the drive and rectification circuit 61 is connected to the linear motor 62 , and is connected to the input end of the boost circuit 63 through the switch Q6 ; the output end of the boost circuit 63 is connected to the input end of the energy storage circuit 64 .

It can be understood that the difference between the circuit structures shown in FIG. 6A and FIG. 5A is that the driving and rectifying circuit 61 in FIG. 6A can realize the two functions of the driving circuit 51 and the rectifying circuit 53 in FIG. 5A . Next, only the circuit structure and working principle of the driving and rectifying circuit 61 will be introduced in detail. For the description of the structure and working principle of the other circuits, reference can be made to the introduction to FIG. 5A above, and details will not be repeated here.

The driving and rectifying circuit 61 is still formed based on the "H-bridge driving", specifically including "H-bridge driving" and two other switching components Q8 and Q9, which can be compared with the "H-bridge driving" described above. The switching components Q1-Q4 in "H-bridge drive" are the same, such as triodes or MOSFETs. FIG. 6A only exemplarily shows that a MOSFET is used as a switch component, but this embodiment of the present application does not limit it.

The processor can control the vibration process of the linear motor by controlling the states of Q8 and the four switching components Q1-Q4 of the H-bridge. details as follows:

First, when the processor controls Q8 to turn on, the power supplies power to the drive circuit. Further, the processor can control the working state of each switch by inputting control signals to the switch components in the drive circuit. The control signal can be, for example, a PWM signal. For the principle of driving the linear motor to vibrate through the PWM signal, reference can be made to the introduction above.

Next, an equivalent circuit diagram for driving a linear motor to vibrate by controlling the on and off of Q1-Q4, Q8, and Q9 through PWM signals is introduced in conjunction with FIG. 6B-FIG. 6C.

As shown in Figure 6B, in the case of controlling Q8 to be turned on and Q9 to be turned off, when the PWM signal is input to Q1 and Q3, but there is no PWM signal input to Q2 and Q4 or the duty cycle of the PWM signal input by Q2 and Q4 is At 0, the equivalent circuit of the driving and rectifying circuit 61 is that Q8, Q1, and Q3 are turned on, and the branches where Q2 and Q4 are located are disconnected. The power supply voltage first passes through Q8, Q1 and then flows from the left end of the linear motor to the right end and is grounded through Q3. Thus, the linear motor is provided with a driving current to the right, thereby driving the linear motor to vibrate to the right.

As shown in Figure 6C, in the case of controlling Q8 to be turned on and Q9 to be turned off, when the PWM signal is input to Q2 and Q4, but there is no PWM signal input to Q1 and Q3 or the duty cycle of the PWM signal input by Q1 and Q3 is At 0, the equivalent circuit of the driving and rectifying circuit 61 is that the branches where Q8, Q2, and Q4 are located are turned on, and the branches where Q1 and Q3 are located are disconnected, and the power supply voltage first flows through Q8 and Q4 from the right end of the linear motor to the left end and passes through Q2 Grounded to provide a drive current to the left for the linear motor, thereby driving the linear motor to vibrate to the left.

When the drive circuit stops working, the linear motor starts to damp vibration. During the vibration damping process, the linear motor may generate an induced electromotive force that alternates between positive and negative. Therefore, a rectifier circuit is needed to convert the induced electromotive force, which changes positive and negative alternately, into a voltage whose polarity is always positive. It is worth noting that between the two ends of the linear motor, that is, between Q1 and Q2, and between Q3 and Q4, there are zero-crossing detector 1 and zero-crossing detector 2, a voltage comparator or ADC zero-crossing detection, etc. can realize Circuit devices for voltage polarity detection (not shown in FIG. 6A ). The zero-crossing detector can use an operational amplifier, a transistor, or an optocoupler IC to implement a zero-crossing detection circuit. The implementation form of the zero-crossing detection is not limited in the embodiment of the present application. The zero-crossing detector can detect the change of induced electromotive force from positive to negative and from negative to positive. When it is detected that the induced electromotive force changes from negative to positive, the working mode of the control circuit is as described in Figure 6D below. When it is detected that the induced electromotive force changes from positive to negative, the working mode of the control circuit is as shown in the figure 6E,

Next, an equivalent circuit diagram for realizing rectification by controlling the on and off of Q1-Q4, Q8, and Q9 through PWM signals is introduced in conjunction with FIG. 6D-FIG. 6E.

Referring to Fig. 6D, Fig. 6D exemplarily shows that when the zero-crossing detector detects that the linear motor generates a positive potential (positive potential means that the left side of the linear motor is positive and the right side is negative), the equivalent of the driving and rectifying circuit 61 Circuit schematic.

As shown in Figure 6D, when Q9 is controlled to be turned on and Q8 is turned off, Q1 and Q3 are controlled to be turned on at this time, and the other switches are turned off. connected, the branch circuit where Q2 and Q4 are located is disconnected, and the induced current formed by the induced electromotive force in the loop first flows from the left end of the linear motor to the booster circuit 63 through Q1 and Q9.

Referring to FIG. 6E, FIG. 6E shows an example that when the zero-crossing detector detects that the linear motor generates a negative potential (note that the negative potential means that the left side of the linear motor is negative and the right side is positive), the equivalent of the driving and rectifying circuit 61 Circuit schematic.

As shown in Figure 6E, when Q9 is controlled to be turned on and Q8 is turned off, Q2 and Q4 are controlled to be turned on at this time, and the remaining switch tubes are turned off. If the branch circuit where Q1 and Q3 are located is disconnected, the induced current formed by the induced electromotive force in the circuit first flows from the left end of the linear motor to the booster circuit 63 through Q4 and Q9.

It can be seen that the positive and negative changes of the induced electromotive force are detected by the zero-crossing detector to control the circuit to work in the equivalent circuits shown in Figure 6D and Figure 6E respectively, so as to realize the induction formed by the positive and negative alternating induced electromotive force in the loop. The direction of the current always flows from Q9 to the boost circuit 63, thereby ensuring that the current obtained by the subsequent circuit is a positive current, that is, the direction of the current is unchanged, and the purpose of adjusting the AC generated in the damped vibration of the linear motor to DC is achieved.

In addition, the induced current generated by the linear motor during mechanical vibration will flow to the boost circuit of the energy recovery module through the switch Q9. For the description of the structure and working principle of the booster circuit 63 and the energy storage circuit 64, reference may be made to the introduction to FIG. 5A above, and details will not be repeated here.

To sum up, after adopting the linear motor drive circuit and method provided by the embodiment of the present application, after the drive module switches from driving the linear motor to stop driving the linear motor, the linear motor continues to damp the vibration due to inertia. The control energy recovery module recovers the electric energy generated by the damped vibration of the linear motor. Afterwards, the recovered electric energy is supplied to other low-power consumption modules such as control modules. Thereby improving the power supply efficiency of electronic equipment, reducing power loss, and increasing battery life.

In addition, after adopting the linear motor drive circuit and method provided by the embodiment of the present application, the induced electromotive force generated by the inertia of the linear motor and the energy recovery circuit form a loop, so that the linear motor generates a counter electromotive force that hinders vibration, preventing it from continuing to vibrate, thereby The vibration tailing time of the linear motor is shortened, making the user's vibration experience more crisp.

Based on the above introduction to the linear motor drive device, linear motor circuit voltage simulation diagram provided by this application, and the drive circuit structure and working principle of the linear motor, the following is an introduction to the electronic equipment that the linear motor provided by the embodiment of the application can be applied to .

In the embodiment of the present application, electronic devices using linear motors can be mobile phones, cameras, smart watches, sports bracelets, tablet computers, ultra-mobile personal computers (ultra-mobile personal computer, UMPC), netbooks, and cellular phones, personal Digital assistant (personal digital assistant, PDA), augmented reality (augmented reality, AR) equipment, virtual reality (virtual reality, VR) equipment, artificial intelligence (artificial intelligence, AI) equipment, wearable equipment, vehicle equipment, smart home devices and/or smart city devices, etc. The embodiment of the present application does not limit this.

Next, the software and hardware architecture of the electronic device provided by this application will be introduced with reference to FIG. 7 . FIG. 7 is a hardware architecture diagram of an electronic device using a linear motor provided by an embodiment of the present application.

As shown in Figure 7, the electronic device may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (universal serial bus, USB) interface 130, a charging management module 140, a power management module 141, a battery 142, Antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, audio module 170, speaker 170A, receiver 170B, microphone 170C, earphone jack 170D, sensor module 180, button 190, linear motor 191, indicator 192, camera 193 , a display screen 194, and a subscriber identification module (subscriber identification module, SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, bone conduction sensor 180M, etc.

It can be understood that, the structure shown in the embodiment of the present invention does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device may include more or fewer components than shown in the illustrations, or combine certain components, or separate certain components, or arrange different components. The illustrated components can be realized in hardware, software or a combination of software and hardware.

The processor 110 may include one or more processing units, for example: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processing unit (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), controller, video codec, digital signal processor (digital signal processor, DSP), baseband processor, and/or neural network processor (neural-network processing unit, NPU), etc. Wherein, different processing units may be independent devices, or may be integrated in one or more processors.

The controller can generate an operation control signal according to the instruction opcode and timing signal, and complete the control of fetching and executing the instruction.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in processor 110 is a cache memory. The memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to use the instruction or data again, it can be called directly from the memory. Repeated access is avoided, and the waiting time of the processor 110 is reduced, thereby improving the efficiency of the system.

In the embodiment of the present application, the processor 110 may call a third application program to obtain information about events in multiple application programs, and detect whether there is a conflict event between the various events, and if so, call a corresponding module such as a display screen 194, Audio module 170 or indicator light 192 to output prompt information. For the introduction of the third application program and multiple application programs, reference may be made to the previous specific description, and for the specific method of detecting conflict events, reference may be made to the description of the method embodiments below, which will not be repeated here.

In this application, the processor 110 can also control the vibration of the linear motor 191 and control the energy recovery circuit in the linear motor drive circuit to recover the energy generated during the vibration damping process of the linear motor.

For example, when the processor 110 detects that the electronic device receives an incoming call, message, or alarm clock, the processor can control the drive circuit in the linear motor drive device to start working, and then drive the linear motor 191 to vibrate;

For another example, when the processor 110 detects that the vibration time of the driven linear motor 191 exceeds a preset time, or detects that an incoming call is turned on or rejected, or detects that the alarm clock is turned off, the processor 100 controls the drive circuit in the linear motor drive device Stop driving, and control the energy recovery circuit to start working. At this time, the energy recovery module can collect the electric energy generated during the vibration damping process after the linear motor is stopped;

For another example, when the electric energy collected by the energy recovery module exceeds the preset electric energy, the processor 110 may also control the energy recovery module to provide the collected electric energy to other low power consumption modules.

Regarding the circuit structure and working principle of the linear motor drive device and the energy recovery module, reference may be made to the specific description of the method embodiment above, and details will not be repeated here.

It can be understood that the interface connection relationship between the modules shown in the embodiment of the present invention is only a schematic illustration, and does not constitute a structural limitation of the electronic device. In other embodiments of the present application, the electronic device may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

The charging management module 140 is configured to receive a charging input from a charger. Wherein, the charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 can receive charging input from the wired charger through the USB interface 130 . In some wireless charging embodiments, the charging management module 140 may receive wireless charging input through a wireless charging coil of the electronic device. While the charging management module 140 is charging the battery 142 , it can also supply power to the electronic device through the power management module 141 .

The power management module 141 is used for connecting the battery 142 , the charging management module 140 and the processor 110 . The power management module 141 receives the input from the battery 142 and/or the charging management module 140 to provide power for the processor 110 , the internal memory 121 , the display screen 194 , the camera 193 , and the wireless communication module 160 . The power management module 141 can also be used to monitor parameters such as battery capacity, battery cycle times, and battery health status (leakage, impedance). In some other embodiments, the power management module 141 may also be disposed in the processor 110 . In some other embodiments, the power management module 141 and the charging management module 140 may also be set in the same device.

In the embodiment of the present application, the power management module 141 can be used to control the battery 142 to provide the working voltage to the linear motor driving device.

The linear motor 191 can generate a vibrating prompt. The motor 191 can be used for incoming call vibration prompts, new messages, alarm clock prompts, and can also be used for touch vibration feedback. For example, touch operations applied to different applications (such as taking pictures, playing audio, etc.) may correspond to different vibration feedback effects. The motor 191 may also correspond to different vibration feedback effects for touch operations acting on different areas of the display screen 194 . Different application scenarios (for example: time reminder, receiving information, alarm clock, games, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect can also support customization.

Various implementation modes of the present application can be combined arbitrarily to achieve different technical effects.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server, or data center by wired (eg, coaxial cable, optical fiber, DSL) or wireless (eg, infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, a Solid State Disk).

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments are realized. The processes can be completed by computer programs to instruct related hardware. The programs can be stored in computer-readable storage media. When the programs are executed , may include the processes of the foregoing method embodiments. The aforementioned storage medium includes: ROM or random access memory RAM, magnetic disk or optical disk, and other various media that can store program codes.

In a word, the above description is only an embodiment of the technical solution of the present invention, and is not intended to limit the protection scope of the present invention. All modifications, equivalent replacements, improvements, etc. made according to the disclosure of the present invention shall be included in the protection scope of the present invention.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions described in each embodiment are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the various embodiments of the application.

Claims

A linear motor drive circuit, characterized in that the linear motor drive circuit includes: a control module, a drive module, a linear motor, and an energy recovery module; wherein:

When the control module is controlling the driving module to stop driving the linear motor to vibrate, the linear motor is used to start damping vibration;

The control module is also used to control the energy recovery module to collect the electric energy generated by the linear motor during vibration damping.
The linear motor drive circuit according to claim 1, wherein,

The energy recovery module is also used to provide the collected electric energy to the first module after the energy recovery module collects the electric energy generated by the linear motor in the damped vibration; the first module includes: the Any one or more of the above-mentioned control modules and other low-power chips.
The linear motor driving circuit according to claim 1 or 2, wherein,

The control module is further used to control the drive module to drive the linear motor to vibrate before the control module controls the drive module to stop driving the linear motor to vibrate.
The linear motor drive circuit according to any one of claims 1-3, wherein the energy recovery module comprises: a rectification circuit and an energy storage circuit; wherein:

The rectifier circuit is used to convert the collected first voltage generated by the linear motor during damped vibration into a second voltage;

The first voltage is a voltage with alternating positive and negative polarities and varying amplitude; the second voltage is a unidirectional pulsating DC voltage with constant polarity and varying amplitude;

The energy storage circuit is used to store the collected electrical energy generated by the linear motor during vibration damping.
The linear motor drive circuit according to claim 4, wherein,

The energy recovery module further includes a filter circuit, the filter circuit is used to convert the second voltage output by the rectification circuit into a third voltage; the third voltage has the same polarity as the second voltage, and the The amplitude variation coefficient of the third voltage is lower than the amplitude variation coefficient of the second voltage;

or,

The energy recovery module further includes a boost circuit, and the boost circuit is used to convert the second voltage into a fourth voltage; the fourth voltage has the same polarity as the second voltage, and the fourth voltage has the same polarity as the second voltage. the magnitude of the voltage is greater than the magnitude of the second voltage;

or,

The energy recovery module also includes a filter circuit and a boost circuit,

Wherein, the filter circuit is used to convert the second voltage output by the rectifier circuit into a third voltage, and then the boost circuit is used to convert the third voltage into a fifth voltage; the fifth voltage The polarity of the third voltage is the same, and the magnitude of the fifth voltage is greater than the magnitude of the third voltage; or, the step-up circuit is used to convert the second voltage into a fourth voltage, Afterwards, the filter circuit is used to convert the fourth voltage into a sixth voltage; the sixth voltage has the same polarity as the fourth voltage, and the amplitude variation coefficient of the sixth voltage is lower than that of the sixth voltage. Amplitude variation coefficient of the fourth voltage.
The linear motor drive circuit according to claim 5, wherein,

The rectification circuit is specifically any one of the following: full-wave rectification, half-wave rectification;

The energy storage circuit is specifically a capacitor, an inductor, a battery, or a circuit composed of capacitors and inductors connected in series and in parallel;

The filter circuit is specifically any one of the following: a capacitor filter circuit, an inductance filter circuit, a π-type RC filter circuit, a π-type LC filter circuit, an active filter circuit or an electronic filter circuit;

The boost circuit is specifically any one of the following: a boost DC/DC converter, a Boost circuit, and a boost charge pump.
The linear motor drive circuit according to any one of claims 1-6, characterized in that,

The driving module and the rectifying module are integrated in the same electronic circuit or independently in different electronic circuits.
A linear motor drive method, characterized in that the method is applied to a linear motor drive circuit, and the linear motor drive device includes: a control module, a drive module, a linear motor, and an energy recovery module; the method includes:

The control module controls the driving module to stop driving the linear motor to vibrate, and the linear motor starts to damp vibration after stopping being driven;

The control module controls the energy recovery module to collect electric energy generated by the linear motor during vibration damping.
The method according to claim 8, characterized in that, after the energy recovery module collects the electric energy generated by the linear motor in the damped vibration, the method further comprises:

The energy recovery module provides the collected electric energy to the first module; the first module includes any one or more of the control module and other low power consumption chips.
The method according to claim 8 or 9, wherein before the control module controls the drive module to stop driving the linear motor to vibrate, the method further comprises:

The control module controls the drive module to start, and the drive module drives the linear motor to vibrate.
The method according to any one of claims 8-10, wherein the energy recovery module includes: a rectification circuit and an energy storage circuit; the energy recovery module collects the electric energy generated in the damped vibration of the linear motor, specifically include:

The rectifier circuit converts the collected first voltage generated by the linear motor during damped vibration into a second voltage;

The first voltage is a voltage with alternating positive and negative polarities and varying amplitude; the second voltage is a unidirectional pulsating DC voltage with constant polarity and varying amplitude;

The energy storage circuit is used to store the collected electrical energy generated by the linear motor during vibration damping.
The method according to claim 11, characterized in that,

The energy recovery module further includes a filter circuit, the filter circuit is used to convert the second voltage output by the rectification circuit into a third voltage; the third voltage has the same polarity as the second voltage, and the The amplitude variation coefficient of the third voltage is lower than the amplitude variation coefficient of the second voltage;

or,

The energy recovery module further includes a boost circuit, and the boost circuit is used to convert the second voltage into a fourth voltage; the fourth voltage has the same polarity as the second voltage, and the fourth voltage has the same polarity as the second voltage. the magnitude of the voltage is greater than the magnitude of the second voltage;

or,

The energy recovery module also includes a filter circuit and a boost circuit,

Wherein, the filter circuit first converts the second voltage output by the rectifier circuit into a third voltage, and then, the boost circuit converts the third voltage into a fifth voltage; the fifth voltage and the The polarities of the third voltages are the same, and the magnitude of the fifth voltage is greater than the magnitude of the third voltage; or, the step-up circuit first converts the second voltage into a fourth voltage, and then, the The filter circuit converts the fourth voltage into a sixth voltage; the sixth voltage has the same polarity as the fourth voltage, and the amplitude variation coefficient of the sixth voltage is lower than the amplitude of the fourth voltage coefficient of variation.
The method according to claim 12, characterized in that,

The rectification circuit is specifically any one of the following: full-wave rectification, half-wave rectification;

The energy storage circuit is specifically a capacitor, an inductor, a battery, or a circuit composed of capacitors and inductors connected in series and in parallel;

The filter circuit is specifically any one of the following: a capacitor filter circuit, an inductance filter circuit, a π-type RC filter circuit, a π-type LC filter circuit, an active filter circuit or an electronic filter circuit;

The boost circuit is specifically any one of the following: a boost DC/DC converter, a Boost circuit, and a boost charge pump.
The method according to any one of claims 8-13, characterized in that,

The driving module and the rectifying module are integrated in the same electronic circuit or independently in different electronic circuits.
A chip, the chip is applied to a linear motor drive circuit, the chip includes one or more processors, the processor is used to call computer instructions to make the linear motor drive circuit perform any of the following claims 1-7 one of the methods described.
A computer-readable storage medium, comprising instructions, characterized in that, when the instructions are run on a linear motor drive circuit, the linear motor drive circuit is made to perform the method according to any one of claims 1-7 .
An electronic device, characterized in that the electronic device includes one or more processors and one or more memories and a linear motor drive circuit; wherein the one or more memories and the one or more processors Coupling, the one or more memories are used to store computer program codes, the computer program codes include computer instructions, when the one or more processors execute the computer instructions, the electronic device performs as claimed in The method described in any one of 1-7.